5 points
An atom has a mass number of 65. Its number of
neutrons is the sum of its atomic number and 3. How
many protons, neutrons, and electrons does this atom
have? What is the identity of this atom? *
(justify your answer step by step!)

Oxygen gets oxidized and potassium and chlorine get reduced. The number of electrons moving to have a balanced reaction is 6.

The number of allocated elements in a chemical combination is termed an oxidation number. The oxidation number is generally the count of the number of electrons that a molecule or atom shares, loses, or gains during bond formation.

The given chemical equation will be

\(\rm 2K ^+ + 2Cl^+ + 2O_3^{2-} = 2KClO_3\)

In this reaction, oxygen gets oxidized and potassium and chlorine get reduced.

The number of electrons moving to have a balanced reaction will be

Number of electron = 2 × 3 = 6

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Answer:

Answer down below

Explanation:

Answer:

Organic chemistry

Explanation:

Organic chemistry is part of the chemistry that studies carbon compounds, which also use organic compounds, which have characteristics.

A smaller amount of energy is wasted by the incandescent bulb.

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Answer:

When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly

Explanation:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

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1. There are 8.39 x 10^22 molecules in 41 g of aspartame.

2. The mass of 6.12 moles of aspartame is 1800.4 g.

3. There are 8.55 x 10^24 nitrogen atoms in 7.1 moles of aspartame.

The molecular formula of aspartame is C14H18N2O5. The molar mass of aspartame can be calculated as:

= (14 x 12.01) + (18 x 1.01) + (2 x 14.01) + (5 x 16.00)

= 294.30 g/mol

Number of moles of aspartame in 41 g = 41 g / 294.30 g/mol

= 0.1395 mol

Number of molecules = 0.1395 mol x 6.022 x 10^23 molecules/mol

= 8.39 x 10^22 molecules

2. Mass = number of moles x molar mass

Mass = 6.12 moles x 294.30 g/mol

= 1800.4 g

Therefore, the mass of 6.12 moles of aspartame is 1800.4 g.

3. The molecular formula of aspartame contains 2 nitrogen atoms. To calculate the number of nitrogen atoms in 7.1 moles of aspartame:

Number of nitrogen atoms = number of moles x Avogadro's number x number of nitrogen atoms in one molecule

Number of nitrogen atoms in one molecule of aspartame = 2

Number of nitrogen atoms = 7.1 moles x 6.022 x 10^23 molecules/mol x 2 nitrogen atoms/molecule

= 8.55 x 10^24 nitrogen atoms

Therefore, there are 8.55 x 10^24 nitrogen atoms in 7.1 moles of aspartame.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

Three

Explanation:

Three hydrogen bonds are between guanine and cytosine base pairs

Hopefully, that helps!

To calculate the volume of a gas mixture at standard temperature and pressure (STP), we need to use the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. We can assume that the pressure and temperature are 1 atm and 273 K, respectively, at STP. We also need to find the total number of moles of the gas mixture by adding the moles of each component. Given that we have 5.00 g each of O2, N2, CO2, and Ne gas, we can use their molar masses to convert grams to moles. The molar masses are 32.00 g/mol for O2, 28.02 g/mol for N2, 44.01 g/mol for CO2, and 20.18 g/mol for Ne. Therefore, the moles of each component are:

The total number of moles of the gas mixture is:

Plugging in the values into the ideal gas law, we get:

Therefore, the volume of this mixture at STP is 15.6 L.

Temperature shows the degree or size of the heat of an object. Simply put, the higher the temperature of an object, the hotter it is. Microscopically, temperature shows the energy possessed by an object.

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Answer:

A) 1 meters

Explanation:

i hope that's right

Answer: B volume

Explanation: that tool is used to measure volume or liquid

Answer:

B. Volume

Explanation:

test

Answer:

So one mole of Fe2O3 contains two moles of Fe3+ ions.

Explanation:

As there is an internal mole ratio of 2:3

It means that there are 2moles of iron within every mole of iron(III) oxide.

Iron III oxide is an ionic compound composed of Fe3+ ions and O2- ions. According to the formula, there are three O2- ions for every two Fe3+ ions.

Extra:

One 'unit' of Fe2O3 has two Fe3+ ions and three O2- ions, hence a dozen Fe2O3 contains two dozen Fe3+ ions and three dozen O2- ions, and a mole Fe2O3 contains two moles Fe3+ ions and three moles O2- ions.

(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer:

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

In each pair, the solution that contains the weaker conjugate acid is more basic. Without any calculations, we can determine which solution is more basic by identifying the stronger conjugate acid in each pair.

In Part A, KClO is a stronger acid than NaF, so the solution in (b) is more basic in Part B, NaBrO is a stronger acid than NaBr, so the solution in (b) is more basic in Part C, HNO2 is a weaker acid than KOH, so the solution in (b) is more basic in Part D, NH4Cl is a weaker acid than HCN, so the solution in (a) is more basic.

It is important to note that while we did not perform any calculations, this method only works for comparing solutions with the same concentration. If the concentrations were different, we would need to perform calculations to determine which solution is more basic. A

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Answer:

a)Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b) 0.125 moles of hydrogen gas is reduced in the reaction.

C) 3.18 L

d)2.25 g of water

Explanation:

a) the equation of this reaction is;

Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b)

Number of moles= concentration × volume= 1.0 × 250/1000 = 0.25moles of HCl

From the equation;

2 moles of HCl yields 1 mole of hydrogen gas

Hence 0.25 moles of HCl yields 0.25 × 1/2 = 0.125 moles of hydrogen gas

Thus 0.125 moles of hydrogen gas is reduced in the reaction.

c)

P= 760 mmHg (standard pressure)

V= ????

T= 298 K

n= 0.125 moles

R= 0.082 atm dm-3K-1mol-1

Since the gas is collected over water, SVP of hydrogen at 25°c is 28mmHg

Therefore; P=760-28= 732mmHg

But

1 atm =760 mmHg

Therefore 732 mmHg= 732/760= 0.96 atm

PV=nRT

V= nRT/P

V= 0.125 × 0.082 × 298/0.96

V= 3.18 L

Note 1dm-3=1L

d)

2H2(g) + O2(g) ----> 2H2O(g)

From the equation;

2 moles of hydrogen yields 2 moles of water

0.125 moles of hydrogen yields 0.125 moles of water

Mass of water = 0.125 moles × 18gmol-1 = 2.25 g of water

There is a possibility that sodium hydroxide may react with ethanol to form sodium ethoxide and water instead of forming the enolate.

Ethanol, also known as ethyl alcohol or grain alcohol, is a clear, colorless liquid with a slight odor and a burning taste. It is the most common type of alcohol found in alcoholic beverages, and is also used as a solvent, fuel, and antiseptic.

Chemically, ethanol is a simple alcohol with the molecular formula C2H5OH. It is produced through the fermentation of sugars by yeast or other microorganisms, and is also commonly synthesized from ethylene through the process of hydration.

Ethanol has a wide range of uses in industry and everyday life. It is used as a fuel additive to increase octane levels in gasoline, as a solvent in perfumes, cosmetics, and pharmaceuticals, and as a disinfectant for medical instruments and surfaces. In addition, ethanol is a common recreational drug, and is consumed in the form of beer, wine, and spirits.

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Answer:

116 km...

Explanation:

as mentioned in the question, speed is constant....as it is clearly given the speed is 116 km per hour....so it will go 116km in an hour.

Answer:

H2O < NH3 < CCl4 < BCl3

Explanation:

Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.

The VSEPR model  determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.

Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.

Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.

From the given compounds;

H20 have a bond angle of 104.5°

NH3 have a bond angle of 107°

BCl3 have a bond angle of 120°

CCl4 have a bond angle of 109.5°

thus in an increasing order of bond angle:

H2O < NH3 < CCl4 < BCl3

Answer:

56.2 g

Explanation:

Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The nucleus is composed of protons and neutrons. We know that the mass of the proton is 1640 times the mass of the electron. The neutron only contributes to the mass of the atom.

Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The electron has a negligible mass therefore, the electron does not contribute to the mass of the atom.

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Answer:

the food chain you mean

Explanation:

pollution than mosquitoes then alligators

When sodium sulfate reacts with carbon, then carbon dioxide and sodium sulfide are formed. When 5 gm of sodium sulfate reacts then 0.854 gms of carbon is consumed.

A stoichiometry balanced equation is the use of the reaction to calculate the moles and the mass of the reactant consumed or the products produced.

The balanced chemical reaction:

1 Na₂SO₄ + 2 C → Na₂S + 2 CO₂

1 mole of sodium sulfate requires 2 moles of carbon to produce 1 mole and 2 moles of sodium sulfide and carbon dioxide respectively.

The molar mass of sodium sulfate = 142.05 gm

Two moles of carbon weigh = 24.02 gms

If 1 mole combines with 2 moles of carbon then 142.05 gms reacts with 24.02 gms of carbon. Hence, 5.00 gm reacts to:

(5 × 24.02) ÷ 142.05 = 0.845 gms

Therefore, 0.845 gms of carbon is used by 5 gms of sodium sulfate.

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The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.

The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.

Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages

To calculate the percent abundance of each isotope in a sample of an element,  the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.

Mathematically, the formula for relative abundance is given as;

R.A = ( number of atoms of isotope / total number of atoms ) x 100%

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146 g sodium chloride is formed when 1.25 moles of chlorine gas react vigorously with excess sodium.

Sodium chloride also known as table salt has the chemical formula of NaCl. It is also known as Rock salt which is consumed by humans.

Balancing the given equation:

2Na ₊ Cl₂ → 2NaCl

Given:

The number of moles of chlorine = 1.25 moles

Number of NaCl formed :

1.25 mole Cl₂ ₓ 2 mole NaCl ÷ 1 mole Cl = 2.5 mole

Mass of sodium chloride formed :

2.5 mole NaCl × 58.44 g NaCl ÷ 1 mole NaCl = 146 g.

146 g sodium chloride is formed when 1.25 moles of chlorine reacts with excess sodium.

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Answer:

As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/

Explanation:

Answer:0.19m

Explanation:

Molality (m) of the solution is  = 0.192 mol/kg. Molality (also molal concentration) is represented by symbol m, it measures the number of moles of solute (here a non-electrolyte solute A) present  in 1 kg of solvent. Here, moles of solute can be calculated by dividing given mass of non-electrolyte A with molecular weight of A.

Molecular mass of non-electrolyte A = 60g

Mass of non-electrolyte A = 6g

Volume of solution = 500mL

Density of solution = 1.05g

To calculate molality of solution using formula of molality:

Molality = moles of solute / kilograms of solvent (mol/kg). Here we need to calculate mass of the solvent in kg that is not directly given in the question. Hence, it is required to calculate mass of the solution first and then subtract the mass of solute from it. Also, to calculate the mass of solution, density and volume are given. So, the calculations are done as follows;

Firstly,

To calculate mass of solution using formula of density; D (ρ) = mass/volume. Density (ρ) is the mass of substance divide by it's volume. Therefore, Mass of solution = Density  × volume

Mass of solution = 1.05 × 500

Mass of solution = 525 g

Now, Mass of solvent is calculated as Mass of solute (non-electrolyte A) subtracted from mass of solution. Therefore,

Mass of solvent = 525 - 6 = 519 g (0.519 kg)

Moles of solute are calculated as given weight of solute divided by molecular weight of solute. Hence, moles of solute = 6/60

Moles of solute = 0.1

Molality of solution is calculated as moles of solute divided by mass of solvent or kilograms of solvent (mol/kg)

Molality of solution = 0.1/ 0.519

Molality (m) = 0.192 mol/kg

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Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

The relationship in which one species kills and consumes another species is known as predation.

Predation is an essential component of ecosystems, influencing not only the predator and prey but also the surrounding environment and other organisms in the food web.Predation is widespread in nature and is found in all major taxa, including bacteria, fungi, plants, and animals.

As a result, predation affects all levels of the food web, from primary producers to apex predators.Predators are classified as carnivores, meaning they feed on other animals, and herbivores, which feed on plants. Some predators are generalists, meaning they eat a wide variety of prey, while others are specialists, feeding on a specific type of prey. The type of predator often determines the hunting strategy, such as ambush, pursuit, or scavenging.

The prey is classified as either active or passive defenses. Active defenses are those that involve the prey moving or taking some other action to avoid being eaten, such as fleeing or hiding. Passive defenses are those that do not require any action on the part of the prey, such as cryptic coloration or chemical defenses.

When predators are introduced to an ecosystem, they can have a significant impact on the prey population and the surrounding environment. Predators can reduce the number of prey, which can lead to a cascade of effects through the food web.

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